128778246 has 24 divisors (see below), whose sum is σ = 279424080. Its totient is φ = 42863856.

The previous prime is 128778227. The next prime is 128778271. The reversal of 128778246 is 642877821.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8560 + ... + 18188.

It is an arithmetic number, because the mean of its divisors is an integer number (11642670).

Almost surely, 2^128778246 is an apocalyptic number.

128778246 is an abundant number, since it is smaller than the sum of its proper divisors (150645834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128778246 is a wasteful number, since it uses less digits than its factorization.

128778246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10380 (or 10377 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 128778246 is about 11348.0503171250. The cubic root of 128778246 is about 504.9877407735.

The spelling of 128778246 in words is "one hundred twenty-eight million, seven hundred seventy-eight thousand, two hundred forty-six".